Yaichi (Ryuta Sato) is a single father and he raises his elementary school aged daughter alone. One day, a foreign man named Mike (Baruto Kaito) visits him. Yaichi has an identical twin brother Ryoji, but Ryoji moved to Canada years ago. They have disconnected since that time. Mike introduces himself as the husband of Ryoji. They are a married gay couple. Yaichi is confused and doesn't know how to deal with Mike.
The Music Kingdom contains musical treasures called Sound Jewels, which together produce the "Song of Blessings." The Sound Jewels are stolen by Maou, who corrupts them into Negative Jewels. Through the Dokudoku-dan, the Negative Jewels are used to turn humans into Negative Jewelers to spread a Negative Aura for Maou to use in his plan to conquer the human world by composing an evil song. In order to recover the Sound Jewels, the goddess of the Music Kingdom sends the Fairy Rhythms; Poppun, Rocky, and Kuranosuke, to the human world to seek help.
Kaido Höövelson known as Baruto Kaito is a former professional sumo wrestler and current mixed martial arts fighter and actor from Estonia. Making his debut in May 2004, he was one of only two Estonians ever to join sumo in Japan.